With the rapid development of urbanization, vehicle travel has became one of our major transportation, but the increasing number of vehicles has also lead tofrequent traffic accidents. According to the National Traffic Accident data,major traffic accidents are caused when vehicles are speeding, obviously  traditional speed limit signs alone cannot meet the needs of traffic safety. Inresponse to the long- standing problems of traditional speed limit signs suchas Chaotic, Unclear,and Unobtrusiveness. Based on DI